[en] SCOPERS-2 is a new version to the FLARE program which had been developed to simulate the core physical characteristics of boiling water reactors. A generalized FLARE type nodal equation is used in SCOPERS-2 together with the nodal-form neutron migration kernel which is derived in a relatively rigorous theoretical way and replaces the empirical kernel used in the FLARE. The effort was also made to expand the flexibility of the original FLARE program. The resultant program, SCOPERS-2, has reliable theoretical basis and can be applied to both PWR and BWR with wider options than before. Present report describes the code performance, the physical model used in SCOPERS-2, and describes in detail the format of the input data required to execute various options available in this program. The input and output of sample problems for both PWR and BWR are represented to help user's understanding. Derivation of the new migration kernel is also shown in Appendix. (author)